dim3

Follow this link to the forum to get the current
betas, be part of the community, and keep up with
the development of version 3.

Or follow this link to the code.

dim3 is a free and open-source engine for creating 3D games. Some of the engines
features include shader support, per-pixel lighting, bump, and specular mapping,
real-time lighting and/or baked lighting, particles and other special effects,
skeletal animation and customization through javascript.

Projects run on OS X and Windows, editing suite is OS X only.